Drill-flute-milling machine



' April 6 1926.

R. HERVIG DRILL FLUTE MILLING MACHINE Filed March 23 1922 s Sheets-Sheet 1 ApI-il 6 1926.

R. HERVIG DRILL FLUTE MILLING MACHINE s Shets-Sheet 2 Filed March 23, 1922 l/NTOR.' Richard Herzrl'j 5y /4 N. \mwm April 6 1926.

. R- HERVIG DRILL FLUTE MILLING MACHINE S-Sheets-Shee'i: 5

Filed March 23, 1922 .R, m H H a M Z n wmml flTTORA/EX raves RICHARD HERVIG, OF CHICAGO, ILLINOIS, ASSIGNQE TOIAMERICAN CAR AND FGUNDRY COMPANY, OF NEW YORK, N. '1 A CORPORATEQN OF NEW JERSEY.

DRILL-FLUTE-MILLIN G MACHIN E.

Application filed March 23, 1922. Serial No. 545,992.

To aZZ whom it may dancer 22 lie it known that I, RICHARD Hnnvro, residing at Chicago, Cook County, Illinois, and being a citizen of the United States, have invented certain new and useful Improvements in a Drill-Flutedliilling lvlachine, of which the following is a full, clear, and exact de scription, such as will enable others skilled in the art to which it appertains to make and to use the same, reference being had to the accompanying drawings, which illustrate the preferred form of the invention, though it is to be understood that the invention is not limited to the exact details of construction shown and described, as it is obvious that various modifications thereof within the scope of the claims will occur to persons skilled in the art.

In saie drawings:

Fig. 1 is a top plan View of my improved drill flute milling machine, the cover of a gear casing being removed to show details;

Fig. 2 is a front elevation of my improved machine, parts being broken away to show details;

Fig. 3 is an elevation, partly in section, of the head end of my improved machine;

Fig. 4 is a view of the head spindle showing the groove in the spindle that determines ,the twist of the drill flutes;

Fig. 5 is a view showing the groove of the head spindle developed on a plane surface to show more clearly the change in the degree of curvature of the groove; and

Fig. 6 is apartial vertical section taken on the line 6-6 of Fig. 2.

t is the object of my invention to provide animproved machine for milling the flutes of twist drills and more particularly of drills having the degree of twist decrease as the distance from the point of the drill increases. It is also an object of my invention to provide a machine of the type described that may be readily changed to mill drills the flutes of which have a uniform or any desired twist.

*With these and other objects in view, my invention comprises a machine having a sup portl upon which is carried a base 2 hav ng guides on which a sliding head 3 carrying the blank, and cross slides 4c and 5 carrying the cutting tools are adapted to reciprocate, the guides for the cross slides 4E and 5 being at right angles to the guides for the head 8. The head 8 comprises a plurality of hearings (3 having a spindle 7 rotatably mounted therein but prevented from moving longitudinally in said bearings by a collar 8 threaded on the spindle 7 and locked in position thereon by a set screw 9. The spindle 7 is provided with a groove 12, as shown in nigs. 4 and 5, and is adapted to carry a chuck 10 inwhich a blank 11 is secured. The shape of the groove 12 will vary, being straight when it is desired to give the drill flutes a uniform twist diverging from a straight groove, as shown in ll 4i and 5, when it is desired to give the drill flutes a decreasing twist, or diverging in the opposite direction when it is desired to give the drill flutes an increasing twist. To change the machine to produce one or another of the types of drills indicated, it is only necessary to place in position in the bearings (S a spindle 7 having a groove 12 of the proper shape.

To reciprocate the head 3 on the base 2 there is provided a shaft 13 rotatably mounted in hearings in the base 2, but fixed against longitudinal movement therein, and

having a threaded portion 14; engaging in a threaded bushing 15 fixedly mounted in an opening in a downwardly projecting lug 16 that is formed'integral with the head 3 and adapted to travel in an opening formed in the base 2. To operate the shaft 13 there is provided a shaft 17 mounted in a bearing 18 formed integral with a gear casing 19 that is secured to the base 2 by the bolts 20. The shaft 17, driven from any suitable source of power by a belt (not shown) that engages the pulley 21, has seemed thereon gears 22 and 23, the gear 22 driving a gear 24 rotatably mounted on the shaft 13 while the gear 23' drives through an idle gear 231, a gear 25keyed upon a worm shaft 26 mounted in hearings in the gear casing 19. Rotatably mounted upon the shaft 13 is a worm wheel 27 driven by the worm shaft 26. Slidably mounted upon the shaft 13, but keyed thereto so as to rotate therewith, is a clutch member 28 operated by a yoke 29 pivotally mounted, as at 30, in the gear casing 19. The yoke 29 is operated by a rod 31 extending from the yoke 29 towards .the head 3 and is provided with an integral lug 32 engaged by a spring pressed plunger that is adapted to hold the yoke 29 at the limit of its movement in both directions. When the yoke 29 is at the limit of its movement in one direction. the clutch member 29 engaged with a cooperating clutch member formed integral with the worm gear QT so that the shaft 13 is driven slowly, in the direction to bring the blank to the cutters, from the pulley 21 through shaft 2?, gears 23, 231, and 25, worm shaft 26 and worm gear '27 and when the yoke at the limit of its movementin the opposite direction, the clutch member 98 is em ged with a to operating clutch member .iormed integral with the gear 2%: so that the shaft 1 is driven more rapidly in the direction to re turn the blank from the cutters. "from the pulley 21 through sha't't 17 and gears 22 and 2- To rotate the spindle 7 as the head 3 is moved on the base 2, the shaft 13 which extends into a gear casing 231- seeured to the base 2, is provided with a gear that engages vith a gear 2-36 that is mounted on an arm 3? loosely mounted on the shaft 13 and held in adjusted position by a lock bolt 36 mounted in the -asing 3t and engaging in a slot ii) in the arm 37. Engaging with the gear 36 is a gear loosely mounted on the spindle T and having a set screw ell provided with an end adapted to travel freely in the groove 12 in the spindle T. The gear 40 is held in position in the casing 23:: by a set screw mounted in the casing and having an end adapted to move freely in a groove 51 in the hub of the gear 4-0 It will be seen, theretore that as the shaft 13 is rotated to move the head 3', the gear ll) will be operated and will rotate the spindle 7 and blank 11, the extent of the rotation ot the llank 11 being dependent upon the ratio ot the gears 35 and it) and the shape of the slot 12.

The flutes in the drill blanks are cut by a plurality of ai'igularly disposed cutters mounted on spindles ii in casings it that are adjustably secured by bolts l5 to brackets 4-(3 formed integral with the cross slides l and 5. The spindles 43 are provided with worm wheels i? that are engaged by worm sha'l'ts l8 driven by sprockets 11-9. The sprockets 46) are driven by chains from a countershatt driven from any suitable source of power. lt'ionnted in slots 52 in the cross slides 4 and are blocks 53 provided with openings in which are secured bolts 54- having rectangular heads 55 adapted to travel in diverging slots 56 in members 5? which are mounted tor reciproeatory movement in grooves in the base 2. In order to compensate for the wear of the members 57 in the grooves in the base 2, wedging members 58 are provided. the members 58 being held in adjusted positions by bolts 59 and look nuts (30. The blocks 53 are adjusted in the slot by means ot the bolts (31 and are loeked in adjusted positions by the lock nuts 62. The outer ends of the members 57 are provided with pins (3 3 which engage in slots ti-l: in arms 5 formed integral with the head 3 forming a lost motion connection between the arms 5 and the members 5?. The arms are provided with adjusting bolts (36 which project into the slots til and are held in adjusted positions by lock nuts 67.

The cross slides -land 5 are provided with an integrzl portion (38 having a threaded opening in which are mounted adjusting screws (3!) having cylindrical portions TU which project into openings Tl in the base i? and engage springs 72 mounted in said o ienings. The springs 72 tend, throng eir engagement with the screws (39, to keep lides .land 5 in their extreme outward positions. In the operation of my mach ne, with av blank ll mounted in the chuck it). the head :3 moved forward by means (it ha ill wheel T2 until the end of the s positioned between the cutters '2. at t is time the cutters 42 should be t the inner limit oi their movement and it depth oi cut in the blanks is to decrease "from the point ot the blank the adjusting s-rrew (i should be in Engagement with the pins 6 3. Rod ill in thereupon operated by ncans of bar l, a; to engage the clutch mem er 28 with the clutch member on the worm 2 i at the head I, is moved i 1 tozrward s by he operation of the shalt i l and the spindle T and blank U are. at the same time rotated by the gears 35, 3G and a. bin moved forward and cuts engagement o l? screw (3(3 with pin (33 moves the members 57 'l'orward. As the members 5? move torward. the bloc 52). through the engagement of the bolts Si in the diverging slots 55, are moved outwardly carrying with them the cross slides i and 5 and the outters so that the depth of the cut in the blank it will 4 dually derrcme as the cut prosac the end ol' the forward movement be head '3, a stop T5 on the rod v- 1 engaged by a flange it; on the ill i arm (3 and the rod ill operated to shift the clutch member so tha it engages with the clutch member on he ge r whereupon the rotation of the shaft l will be reversed and the head 1 will be operat id to quickly withdraw the blank 11 from between the cutters until the machine is stopped by the engagement oi the hinge it) with a stop TT or by manually operating the rod 31. At the start ot the return movement ot the head 3. the screw (it; is withdrawn from the pin 3 and the pin 3 travels in the slot (ii: until it engaged by the other end of the slot. This movement oi the head t without a corresponding movement oi the members 3? withdraws the blank 11 so that the cutters 42 do not engage in the groove and the subsequent movement of the members 57 V by which the cutters 42 are moved does not place the cutters 42 in their extreme inner positions until. after the blank 11' has been withdrawn beyond the point at which it would be engaged by the cutters.

l/Vhat I claim is:

1. In amachine of the class described, a base, a head slidably mounted on said base, a work carrying spindle carried by said head, a threaded sha-li't engaging said head and adapted to shift said head and spindle, means operated by said shaft adapted to rotate said spindle, cross slides carrying outters for worn operated by the movement of said head and a connection between said spindle operating means and spindle adapted to vary the rotation 01 said spindle as said spindle is shifted.

2. In a machine of the class described, a base, a head slidably mounted on said base, a work carrying spindle carried by said head, a threaded shaft engaging said head and adapted to shift said head and spindle, means operated by said shalt adapted to rotate said spindle and a. pin and slot connection between said spindle and spindle operating means adapted to vary the rotation of said spindle as said spindle is shifted.

3. In a machine of the class described, a movable head, a Work carrying spindle mounted in said head, means for holding said spindle against longitudinal movement in the head, cross slides carrying cutters for the Work, means to reciprocate said head and rotate said spindle in said head, means varying the rate of rotation of said spindle during movement of said head, and means operatively connecting said cross slides and head to operate said cross slides as said head is advanced, said connecting means being adapted to advance said cross slides after said head is partially retracted and said cutters disengaged from the work.

i. In a machine of the class described, a movable head, a Work carrying spindle movable with said head, a threaded shaft adapted to move said head and spindle and r0 tate said spindle, cross slides carrying cutters for said work, slotted members operatively connected to said slides and lost motion connections between said head and members.

5. In a machine of theclass described, a movable head, a work carrying spindle mounted in said head, means for holding said spindle against longitudinal movement in the head, means to reciprocate said head and spindle, cross slides carrying cutters for the work, operating means for said spindle adapted to vary the rotation of said spindle upon movement of said head and spindle and means operatively connecting said head and cross slidessadapted to advance said cross slides after the work is partially retracted and disengaged from the cutters.

6. In a machine of the class described, a movable head, a Work carrying spindle mounted in said head, means for holding said spindle against longitudinal movement in the head, cross slides carrying cutters for the worln neans to advance said head and rotate said spindle in said head, means varying the rate of rotation of said spindle during the forward movement of said head, and means operatively connecting said head and cross slides to operate said cross slides as said head is advanced, said connecting means being adapted to permit an initial retraction of said head before advancing said cross slides.

7. In a machine of the class described, a movable head, a work carrying spindle rotatably mounted in said head, means to ad Vance said head and spindle at a constant rate, said means being adapted to rotate said spindle in said head and a pin and slot connection between said means and spindle whereby advancing said spindle varies its rotation.

8. In a machine or: the class described, a movable head, means to move said head movable cross slides, leans comprising slotted members operated by head movement for moving said cross slides, arms carried by said head and lost motion connections between said arms and members. i

9. In a machine of the class described a movable head, means tormove said head, cross slides, reciprocating members to operate said cross slides from said head, means connecting said members to said head and a lost motion device in said means and means connecting said reciprocating means and head adapted to permit an initial movement of said head Without operating said cross slides. I

10. In a machine of the class described, a movable head, a work carrying spindle mounted in said head, means for holding said spindle against longitudinal movement in the head, means to reciprocate said head and rotate said spindle, means varying the rate of rotation of said spindle during movement of said head, a cross slide carrying a cutter for the Work, an arm carried by said head, a member having a slot operatively engaging the cross slide and a lost motion connection between said arm and member permitting disengagement of the work from the cutter upon the initiation of the return movement of said head.

11. In a machine of the class described, a movable head, means to move said head, cross slides, members having diverging slots, means on said cross slides engaging in said slots, arms operated by said head and a lost motion connection between said arms and said members.

12. In a machine of the class described, a base, a had slidably mounted on said base, a slotted work carr ing spindle cnllitt by said head, means to advance said head and spindle and means engagi in the slot in said spindle adapted to rotate said spindle in said head, said slot being adapted to vary the rotation ot said spindle as said spindle is advanced.

13. In a machine of the class described, a mo able head. a slotted work *arrving spindle in said head, a thread d shaft adapted to move said head, a gear having spindle operating means engaging in the spindle slot and operating means for said gear mounted on said shatt.

1- In a machine ot the class described, a movable h aid, a work carrying spindle movable vith said head. a threaded shaft, a connection between said shaft and head to cause movement of said head upon rotation of Lil head to *ause movement of said head upon rotation of said shatt, a gear slidablv mounted on said spindle and having means engaging in the slot in said spindle whereby said spindle rotated, and a gear on said shalt operativelv connected to the gear on said spindle, said spindle being given a variable rotation for a uniform rotation of said shaft.

16. In a machine of the class described. movable head, a work carrying spindle mounted in said head, means to reciprocate said head and rotate said spindle, a cross. slide carrying a cutter for the work. an arm carried b said head and a member conne ting said arm and cross slide, said member having a slot deterniining the movement of said cross slide.

17. In a machine ol the class described, a base, a head slidably mounted on said base, a spindle rotatably mounted in said h ad, mains to advance said head and spindle at a uniform rate and rotate said spindle in said head and a pin and slot connection between said means and spindle whcrel;- v advancing' said spindle varies its rotation.

In witness whereof I have hereunto set my hand.

RICHARD H l) llY It 

